I don't know which one is the yellow flowered oxalis weed we have here in NZ, but I had a real infestation when I got back from overseas at one stage. I removed what I could and painted each leaf that came up with a strong solution of glyphosate with an applicator. Only the very occasional one now comes up and gets dealt with. As it was in the garden, covering it was not an option. Ina On 15/02/2012 3:01 p.m., Randall P. Linke wrote: > It appears that if you can > remove them between the time they exhaust their original bulb and before > they can make new ones you have a good chance of controlling it. -- Ina Crossley Auckland New Zealand zone 10a